Changming Ke

Investigation on Slag Resistance of Magnesia Based Castable Containing SiC

Corrosion of four magnesia based castables with different SiC contents by ladle slag was conducted using the static crucible test. Effect of SiC content on the slag resistance of castables was investigated by XRD, SEM, EDAX. The reactions between refractories and slag were simulated through FactSage® thermochemical software. It has been found that SiC can increase the penetration resistance of magnesia based castables, not decreasing their corrosion resistance. With increasing the content of SiC, the SiO2 content and the viscosity of penetrated slag increase. The lower wettability of slag to SiC and the higher viscosity of penetrated slag affect the penetration resistance of magnesia based castables, whereas the reactions between slag and castables affect the corrosion resistance of magnesia based castables. The thermochemical simulation helps to understand the reaction mechanism.